I will list some I saw
1. Hitsuguya's Bankai
2. Byakuya's Bankai vrs Ichigo
3. Komomura's face(although you see it in this episode anyways)
4. Ukitake's Shikai(Already spoiled I think in one of the endings though)
5. A bit of hollow ichigo
6. I believe that is Bankai Ichigo in the flames
7. Renjis Bankai(Yet again in this episode so not much of a spoiler)

Thats everything I saw.